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SPECIFICATIONS 


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FOR A 


THIRD ORDER LANTERN 


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PREPARED AT THE OFFICE OF THE LIGHT-HOUSE BOARD, 
TREASURY DEPARTMENT. 


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SPECIFICATIONS 


• FOR A 

THIRD ORDER LANTERN. 


When the lantern is to have an iron parapet, it will be 
made as shown and described on the drawings and in the 
specifications for Shell Keys light-honse, differing only as 
follows : the glass in each face of the lantern is to be an 
entire plate, instead of in three pieces, as shown and 
described in said drawings and specifications. 

When a brick parapet is used, the lantern will be con- Lantern for a 
structed as shown on Plates 22, 22 I, 22 III, 22 IY, 22 masonr y P ara - 
Y, and 22 YI, of the United States Light-house Portfolio, pe ' 
and in accordance with the following .specifications: 

The plan of the lantern is a regular polygon of ten (10) 
sides. The principal parts are: the gallery, forming the 
base; the metal framing of sash-bars for the plate glass; 
and the domical roof and ventilator. 

The gallery will consist of ten (10) cast-iron segments, Gallery plates 
made as shown on Plate 22, YI, and secured together 
with thirty (30) bolts, (instead of twenty as drawn,) 
made of wrought iron, tool-finished, and each T 9 g of an 
inch diameter. The segments, when joined together, 
form a circular plate 11 feet 9 inches extreme diameter, 
with a central opening for the lens apparatus 4 feet 1 
inch diameter. In order to accommodate the stairway 
inside of the lantern, two of the segments will have their 
inner ends “stopped off” at the line CDE; another of 
the remaining segments must contain a stove-pipe hole 
5J inches diameter. 

The radial joints, and the upper surface in contact 
with the mullion sill, must be planed; the sockets for the 
railing standards must be bored and faced. The upper 
surfaces of the segments, where not planed, must be 
checkered or roughened to the depth of -fc °f an inch. 

Least thickness of metal in the segment J an inch. 

There will be ten (10) wrought-iron railing standards Gallery railing 
inserted in the sockets formed at the joints of the gal¬ 
lery segments, having their centres 2 inches from the 
outer edge. The length of each standard between the 

6 - is 1 ' 6 ? 



4 


Lantern posts. 


Grooves for 
glass. 


Mullion sills. 


Mullion caps. 


socket and rail is 17| inches; diameter at the lower part 
1 inch; diameter at the top | inch. The lower end will 
be tool-finished, and secured with a tool-finished wrought- 
iron nut and washer. The upper end will pass through 
and secure the rail by means of a finished brass nut, 
having a closed end; diameter of screw § inch. 

(The nut is erroneously marked “cast iron” on the 
drawing.) 

The rail will be a wrought-iron ring, 11 feet 6^ inches 
extreme diameter, made in segments, and fastened to¬ 
gether by means of half-lap joints; two countersunk 
screws, £ inch diameter, passing through each lap. The 
size of iron for the rail is 1J" X \"- 

Ten (10) wrought-iron lantern posts, whose dimensions, 
when finished, are 2§ inches wide, 1 inch thick, and 7 
feet 6J inches long, are set vertically, at equal distances 
apart around the base, with their inner edges 4 feet ly-g- 
inches from the axis of the lantern. Nine (9) of the posts 
extend 1 foot 3| inches, and the tenth only 8 inches be¬ 
low the mullion sills into the brick-work. The shorter 
post is to clear the door frame in the parapet. 

Each post must be lined on the outside with brass re¬ 
bates and stops for the plate glass; each made in two 
parts; each rebate is secured to the post with four (4) 
brass screws y inch diameter. The upper glass stop is 
fastened with five (5) brass screws, three of which secure 
the handle to it. The lower stop is secured with three 
brass screws \ inch diameter. The fronts of the iron 
lantern posts, all sides of the rebates and glass stops, 
must be planed. The brass handles must be finished all 
over. 

The mullion sills are shown on Plate 22, IV, where they 
are marked “cast iron.” They must, however, while re¬ 
taining the same general dimensions, excepting the thick¬ 
ness, be made of brass; their length being equal to the 
space between the lantern posts, width 3 r \- inches, height 
4 inches, least thickness inch; thickness of flanges § 
inch. The rebates and glass stops, the end flanges and 
the under sides in contact with the gallery plates, must 
all be planed. Each glass stop will be secured with four 
(4) brass screws J inch diameter. The sills will be se¬ 
cured to each lantern post with one wrought-iron tool- 
finished bolt, | inch diameter, furnished with a suitable 
nut and washer; and to each gallery plate with two 
wrought-iron tap-bolts J inch diameter. 

The mullion caps will be of cast iron, of the form and 
dimensions shown on the drawings. The rebates, glass 
stops, and end flanges, must be planed. The glass stops 
to be of brass, and secured with the same number and 
kind of screws as are used for those of the mullion sills. 


o 


The mullion caps will be secured to each lantern post 
with one wrought-iron tool-finished bolt | inch diameter. 
The tops of all the lantern posts are further united by 
fastening thereon a regular polygon of bar iron 2§" x f ", 
finished size, secured by ten (10) screws § inch diameter, 
which also pass through and secure the lower ends of the 
ribs of the dome. The polygon is made in three (3) seg¬ 
ments. secured together with half-lap joints 4J inches 
long. Through each joint there are 2 screws £ inches 
diameter. 


DOME. 

The ribs and tie-bars forming the frame of the dome Framing of 
to be of wrought iron—the ribs 1J" X §"; tie-bars ii" dome - 
X i". Each rib is an arc of a circle, with an internal ra¬ 
dius of 4 feet £ inch. The lower end has a vertical and 
a horizontal flange, and is secured to the lantern post 
with two wrought-iron tap-bolts f inch diameter—one 
through each flange; the upper end has a single vertical 
flange, and is fastened to the cast-iron crown piece with 
one bolt ^ inch diameter. The tie-bars must be secured 
to each rib with two wrought-iron bolts J inch diameter. 

The cornice of dome is supported by ten (10) cast-iron Comice, 
brackets, of the form and dimensions shown on Plate 
22, III. 

Each bracket is set upon and secured to the wrought- 
iron polygon on the lantern posts with two tap-bolts f 
inch diameter. The upper ends of all the brackets are 
united by a wrought-iron ten-sided polygon, made in 
segments, having half-lap joints 4 inches long, at which 
they are secured together by two countersunk J-inch 
screws passing through each. Size of iron for the poly¬ 
gon is 1J" X . It is secured to each bracket with one 
countersunk screw J inch diameter. 

The spider-frame supporting the adjustable bearing Spider frame, 
for the upper part of the lens apparatus, is to be of 
wrought iron, of the form and dimensions shown on Plate 
22, V. The tie-rods, ten (10) in number, are 1" X f". 

The outer end of each has a jaw formed on it, whereby 
it is secured to the rib of dome with one wrought-iron 
tool-finished bolt J inch diameter. (The jaw is wrongly 
represented on the drawing; it should be so placed as to 
permit the bolt just mentioned to be perpendicular to 
the flat side of the bar.) 

The inner end of each tie-rod has a screw cut on it | 
inch diameter, whereby it is secured to a wrought-iron 
ring, with nuts inside and out for adjustment. The tie¬ 
ring is 11J inches external diameter, and in section is 
1J" x \i n - Each alternate tie-rod is supported by a 


6 


wrought-iron rod J inch diameter, (instead of § inch 
diameter as drawn,) whose upper end is secured to the 
rib of dome, at a distance of 10£ inches from the axis of 
lantern, with a wrought-iron bolt § inch diameter. The 
lower end is secured to the tie-rod with a same sized 
bolt. Cast-iron turnbuckles 3 inches long, with right 
and left screws cut in them, are provided for adjustment. 

Adjustable The bearing for the spindle on the upper part of the 

a 6a anUus rlenS l ens a PP ara f us > consists of a central socket 2| inches di- 

appara us. ame ter by 1J inches deep, with four arms placed at equal 
distances apart, each of which passes through a seat, and 
is adjustable therein by two f-inch set screws. The 
seats have two flanges each, by which they are fastened 
to the wroaght-iron tie-ring with four countersunk screws 
J inch diameter. All parts of the bearing and seats are 
of brass, and must be finished all over. The upper side 
of tie-ring must be faced. 

Copper dome. The dome must be covered with sheet copper, weigh¬ 
ing not less than 32 ounces per superficial foot, laid on 
in ten (10) equal segments, with lock-joints, tinned, ex¬ 
cept below the eaves, where it is to be tinned only for 
soldering. The segments must be secured to each rib 
with four brass screws § inch diameter. The roofing- 
extending downwards along the brackets, is fastened to 
the glass stops of the mullion caps with the same screws 
which secure said glass stops. 

Water spout. At every other bracket, one copper water-spout is 
placed, for conducting the water from the roof. 

Ventilator. The globe, and other parts of ventilator, are to be 
made of sheet copper, weighing. 32 ounces per square 
foot. The globe is 22^ inches diameter, and has in its 
lower part thirty-six (36) holes 2 inches in diameter, ar¬ 
ranged in two rows. The ventilator pipe is 12 inches 
diameter; its lower part is moulded in the form of a sco- 
tia, the base of which is 22 inches diameter, having on 
it a flange 3 inches wide, which will be riveted and sol¬ 
dered to the dome when finally erected upon the light¬ 
house. The upper part of the pipe is perforated with 
fourteen (14) rectangular openings, each 3 T V' X If". 
The globe passes over the pipe, to which it is secured 
with eight copper rivets £ inch diameter. 

Pinnacle. A brass nut and copper pinnacle are soldered to the 

top of the globe. The total height of the nut is 5| 
inches; diameter of its base 5| inches; diameter of body 
2 inches; inside screw 1| inches diameter. The pinna¬ 
cle projects four (4) feet above the nut into which it is 
screwed, and must be furnished at the top with a plati¬ 
num point worth $4. The diameter of the lower part of 
pinnacle is 1^ inches, tapering to ^ inch at the top. 


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The cast-iron crown piece of dome is shown on Plate Crown piece 
22, V. It consists of a polygonal ring, having an inter- 0 ome 
nal diameter of 11 inches; depth 3J inches; least thick¬ 
ness | inch. All the ribs of the dome are clustered 
together, and let into the notches on the outside of the 
ring, to which they are also bolted. 

The crown piece has five arms 3£" x sustaining a 
central socket 3 inches diameter by 4J inches long, into 
which a wrought-iron bolt 1J inches diameter enters, and 
is secured by means of its collar and a nut and washer of 
suitable size. The bolt passes upward, and is screwed 
into the nut on the top of the globe, thereby fixing all parts 
of the ventilator firmly together, and to the dome. The 
socket in the crown piece must be bored and faced, and 
the bolt turned to fit it. The notches for the ribs must 
be planed. 

The inside of dome must be lined with sheet zinc Inside lining 
-jV of an inch thick, put on in ten (10) segments, with | of dome * 
inch lap at the joints, and fastened to each rib with five 
(5) wrought-iron screws £ inch diameter. 

The copper roof plates must have their lock-joints all 
prepared when they leave the workshop, so that they 
may be lowered in their places, and only require the 
joints to be flattened and secured when at the light* 
house. 

To prevent any leakage or condensation of vapor from Tin shelter 
falling upon the lens apparatus, a cone and cowl, formed for lens ' 
of the best XX tin, is placed over it, and fastened with 
five (5) screws to the horizontal tie-rods. (See Plate 22, 

HI.) 

There will be five (5) air registers, made as shown on 
22, I. The pipe and cowl to be of sheet copper, weighing 
32 ounces per superficial foot. Least external diameter 
of pipe 4 inches; diameter of enlarged end for the valve 
seat 6 inches. All its parts must be securely brazed 
together. The valve and seat to be of brass; extreme 
diameter 7 inches; least thickness \ inch; to be finished 
all over. 

The seat and slide to contain four triangular-shaped 
openings, so arranged that when the register is closed 
the solids should lap the voids T \- of an inch. The regis¬ 
ters will be suitably distributed around in the parapet, 
care being taken not to interfere with the other metal 
work. 

A wrought-iron ladder for the lantern gallery, made as 
shown on Plate 22, I, must be provided. There will be 
two stringers, each 2" X I", and 7 feet long, placed 12 
inches apart from out to out. The treads are 9 inches 
apart, and consist of two rods £ inch diameter, placed l£ 
inches apart from centre to centre; the line connecting the 


8 


Painting. 


Marking. 


Boxing. 


centres forming an angle of 80° with the stringers. The 
rods are reduced to \ inch diameter where they enter 
the stringers, to which they must be riveted. 

After inspection at the workshop, all parts of the lan¬ 
tern (except bolts, screws, and surfaces of joints) must 
have two (2) coats of white lead in oil. When finally 
erected, the lantern must have two (2) additional coats 
of paint of such color as may be directed, (generally 
white inside and black outside.) 

The surfaces of joints, also all bolts and screws, must 
be well smeared with a mixture of white lead and tallow, 
which, when necessar}^, may be removed by applying a 
gentle heat. 

All parts of the work must be properly marked with a 
chisel or centre punch, when the materials will bear it; 
when otherwise, it must be painted. 

All parts of the lantern must be substantially boxed 
and strapped with iron. Contents of each box marked 
on its outside. All castings must be made perfectly 
sound and true, or they will be rejected. The wrought 
iron must be of the best quality, made from charcoal 
blooms, tough and fibrous. The entire work must be 
erected and fitted together at the workshop, and exe¬ 
cuted in the best manner, to the satisfaction of an 
authorized agent of the Light-house Board. 

BILL OF MATERIALS. 

Cast Iron . 

10 Gallery plates. 

10 Mullion caps. 

10 Brackets for cornice. 

1 Centre piece for ribs of dome. 

5 Screw couplings for tie-rod supporters. 

Wrought Iron. 

10 Lantern posts. 

10 Ribs for dome. 

10 Tie-bars between ribs of dome. 

3 Segments on top of lantern posts. 

3 Segments on top of brackets. 

3 Segments for gallery railing. 

10‘Standards for gallery railing. 

10 Nuts for lower parts of railing standards. 

5 Tie-rod supporters. 

1 Bolt, with collar and nut, for fastening ventilator to 
dome* 

1 Ring for tie-rods. 

1 Ladder. 


9 


Brass. 


10 

20 

40 

1 

4 
1 

10 

5 

10 


10 

1 

1 

5 


10 


20 


20 

30 

20 

20 

10 

10 

10 

20 

8 

8 


Mullion sills. 

Rebates in front of lantern posts. 

Glass stops. 

Adjustable bearing on tie-rods.. 

Seats for ditto. 

Nut on top of globe. 

Handles on lantern posts.. 

Air register seats and slides. 

Nuts for upper ends of railing standard®. 

Copper. 

Roof and cornice segments. 

Globe. 

Yentilator pipe and base. 

Pipes and cowls for air registers. 


Zinc. 

Segments for inside lining of roof- 
Tin. 

Shelter for lens. 


Bolts and Screws. 

Diameter. Length! 

Inches. Inches. 

Tap-bolts for ribs and segments on lan¬ 
tern posts. § — 

Bolts and nuts for securing mullion caps 

and sills. % 3f • 

Bolts and nuts for securing gallery 

plates. t 9 ¥ m 

Tap-bolts for feet of cornice brackets f 2 

Bolts and nuts for bars between ribs of 

dome. . \ 21- 

Bolts and nuts for fastening ribs to 

crown piece.. J 2 

Bolts and nuts for tie-rods. ^ 2 

Bolts and nuts for tie-rod supporters • • | 2 

Tap-bolts for securing mullion sills to 

gallery plates. \ 2 \ 

Tap-bolts for connecting segments on 

lantern posts. \ 1^ 

Screws for connecting segments on cor¬ 
nice brackets.. \ y 


2 


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10 


Diameter. 


Whole 

Leogth. 


10 Screws for connecting segments on cor¬ 
nice brackets. 

8 Screws for connecting segments of gal¬ 
lery railing. 

8 Set screws for adjustable bearing. 

16 Screws for securing seats of ditto.- 

80 Screws for securing rebates to lantern 

posts.. 

160 Screws for securing glass stops and 

handles.. 

40 Screws for securing copper plates to 

ribs of dome...*. 

50 Screws for securing inside lining of 
dome.. 


Inches. 


1 

'2 


2 

3 
8 
J_ 

4 

1 

4 


X 

4 


8 


Inches' 


1 


1 



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8 


1 


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LIBRARY OF CONGRESS 

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